Mark 12:29

And Jesus answered him Pointing, it may be, to the Scribe's tephillah, תפלה, the little leather box containing in one of its four divisions the Shema(Deuteronomy 6:4), which every pious Israelite repeated twice a day.

The first of all the commandments The Saviour quotes the introduction to the ten Commandments (Deuteronomy 6:4-5) as the first command, not as forming one of the commandments, but as containing the principleof all.